RodBrieger520 RodBrieger520

03-04-2014
Biology

Answered

During the evolution of life on Earth, the photosynthetic organisms initially responsible for raising atmospheric oxygen concentrations from less than 1 percent to about 20 percent were
(A) cyanobacteria
(B) archaea
(C) diatoms
(D) flowering plants
(E) mosses

Answer :

chaospaulo chaospaulo

03-04-2014

B or A the chapter I learned talked about both

Answer Link

Other Questions

Pregunta¿Qué conjunto de pares ordenados [tex]$(x, y)$[/tex] podría representar una función lineal?A. [tex]\{(-4, -6), (-1, -5), (1, -4), (4, -3)\}[/tex]B. [tex

What is the primary function of a battery?A) To store and release electrical energyB) To generate mechanical energyC) To conduct electrical signalsD) To absorb

Question 1:Which of the treatments for chlamydia should not be used during any stage of pregnancy because of its risk to staining the teeth of the fetus?Options

Add a citation to the student's essay, if necessary. The original passage is below.Fancy Fish: Mysteries of the Deep \- a book by Don Fisher, chapter 4, page 9

Which expressions are less than \[610?\]

Un elemento [tex]\( x \)[/tex] (halógeno) con el elemento [tex]\( y \)[/tex] (alcalino-terreo) presentan notación Lewis de enlace:A. [tex]\( 6 \bullet \cdot \ti

Which of the following is NOT a sales goal that can be set in goals? Product quantity, Meetings booked, revenue, deals created

Efectuând calculele în exercițiile ce urmează, se obține:a) [tex]\[1717: 17= 101\][/tex]b) [tex]\[\overline{aaaa}: 11 = 101\][/tex]c) [tex]\[\overline{abcabc}:

Explain how your individuality in relationships could assist you in successfully fighting off peer pressure for risky behavior.(2x2) (4)

Aini prepared 6 liters of fruit punch for a party. She poured them equally into 4 bottles. What is the volume of the fruit punch in each bottle?